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1913 Upper Cretaceous Fossils Chalk Original Antique Print Geology Mounted and Matted Available Framed - Etsy UK
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15" Cretaceous Cimolichthys Skull & Vertebrae - Niobrara Chalk, Kansas (#62787) For Sale - FossilEra.com
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File:Uintacrinus socialis fossil crinoids in chalk (Niobrara Formation, Upper Cretaceous; western Kansas, USA) 9 (15115469629).jpg - Wikimedia Commons
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